Originally when I heard of this, I'd assumed it to have something to do with the Japanese film "Onibaba" (aka "The Hole") but from the plot description it was obvious that it was completely different. Turned out to be surprisingly dark and gripping. The story of a wild teen hideaway gone terribly wrong when only one of the four teens emerges from being locked in an underground bunker in the woods for weeks, with accusations against a fifth member of their private school. The police must investigate as to what actually went on and the events of the bunker are told in flashbacks from differing points of view. Reminded me of bits of "Absolution" and "Blood Relatives" in the way that the real version of the story and the real villain get revealed. The final chilling shot of the movie also reminded me of both "The Omen" and the original version of "The Vanishing" (before the director of that film ruined the ending in his own inferior remake) as a study of evil triumphant. The final death in the actual "hole" of the title was a bit too circumstantial to be effective but the very last twist to the story made up for this. Of course the early version of the events was too dumb to be believable. Who the hell would willingly be locked in a underground bunker in the woods for four days and wait to be let out again. Why be locked in, in the first place? Keira Knightley shows why she's such a rising star and some of her scenes are surprising for a British film, considering her age (not that I'm complaining or prudish of course - actually it's fairly true to how a lot of teens are anyway). Thora Birch was certainly impressive in her role. Desmond Harrington reminded me of "Callan" and "Performance" star Anthony Valentine here.
Ultimately I found it to be a gripping psychological chiller/mystery and the ending cleverly makes me wonder if we still know the full truth as to what happened down in the bunker.
Ultimately I found it to be a gripping psychological chiller/mystery and the ending cleverly makes me wonder if we still know the full truth as to what happened down in the bunker.